cti-stix-elevator

NOTE: This is an OASIS TC Open Repository <https://www.oasis-open.org/resources/open- repositories/>. See the Governance section for more information.

The stix2-elevator is a software tool for converting STIX 1.x XML to STIX 2.0 or 2.1 JSON. Due to the differences between STIX 1.x and STIX 2.x, this conversion is best-effort only. During the conversion, stix2-elevator provides information on the assumptions it needs to make to produce valid STIX 2.x JSON, and what information was not able to be converted.

To convert STIX 2.x JSON back to STIX 1.x XML use the stix2-slider

The stix2-elevator is a "best-effort" attempt to convert STIX 1.x content to STIX 2.x content. Caution should be taken if the elevator is to be used in a production environment as warnings concerning the conversion are often generated. Users should determine which warnings are acceptable and use the --disable option in conjunction with the –error-policy option only to produce results when no other warnings are emitted.

STIX 1.x Composite Indicator Expressions and CybOX 2.x Composite Observable Expressions allow a level of flexibility not present in STIX 2 patterns. These composite expressions can frequently have ambiguous interpretations, so STIX 2 Indicators created by the stix2-elevator from STIX 1.x Indicators containing composite expressions should be inspected to ensure the STIX 2 Indicator has the intended meaning.

For more information, see the documentation on ReadTheDocs.

Please enter any comments on how to improve the elevator into the issue tracker.

Requirements

• Python 3.7+

• python-stix and its dependencies

  Note

  Make sure to use either the latest version of python-stix 1.1.1.x or 1.2.0.x, depending on whether you want to support STIX 1.1.1 or STIX 1.2.

• python-stix2 >= 3.0.0

• stix2-validator >= 3.0.0 and its dependencies

• pycountry >= 20.7.0

• stixmarx >= 1.0.8

Installation

Install with pip

$ pip install stix2-elevator

This will install all necessary dependencies, including the latest version of python-stix.

If you need to support older STIX 1.1.1 content, install python-stix 1.1.1.x first

$ pip install 'stix<1.2'
$ pip install stix2-elevator

You can also install the stix2-elevator from GitHub to get the latest (unstable) version

$ pip install git+https://github.com/oasis-open/cti-stix-elevator.git

Installation Steps for ACS Data Marking Support

ACS data markings correspond to the common marking scheme used by the U.S. government (e.g., U, C, S, TS). To elevate STIX 1.x content that contains ACS data markings, it is necessary to install an additional python package called 'stix_edh'.

Install with pip

$ pip install stix2-elevator[acs]

Usage

It is recommended that you ensure that the input STIX 1.x file is valid before submitting it to the elevator. Use the stix-validator.

As A Script

The elevator comes with a bundled script which you can use to elevate STIX 1.x content to STIX 2.x content:

usage: stix2_elevator [-h]
          [--missing-policy {use-extensions,use-custom-properties,add-to-description,ignore}]
          [--header-object-type {report,grouping}]
          [--custom-property-prefix CUSTOM_PROPERTY_PREFIX]
          [--infrastructure]
          [--acs]
          [--incidents]
          [--package-created-by-id PACKAGE_CREATED_BY_ID]
          [--default-timestamp DEFAULT_TIMESTAMP]
          [--validator-args VALIDATOR_ARGS]
          [-e ENABLED]
          [-d DISABLED]
          [-s]
          [--message-log-directory MESSAGE_LOG_DIRECTORY]
          [--log-level {DEBUG,INFO,WARN,ERROR,CRITICAL}]
          [-m MARKINGS_ALLOWED]
          [-p {no_policy,strict_policy}]
          [-v {2.0,2.1}]
          [-r]
          file

stix2-elevator v4.1.7

positional arguments:

file          The input STIX 1.x document to be elevated.

optional arguments:

-h, --help
              Show this help message and exit

--missing-policy {use-extensions,use-custom-properties,add-to-description,ignore}
              Policy for including STIX 1.x content that cannot be
              represented directly in STIX 2.x. The default is 'add-
              to-description'.

--header-object-type {report,grouping}
              What STIX 2 type to use to store extra information
              from the STIX 1 package header.The default is
              'report'.

--custom-property-prefix CUSTOM_PROPERTY_PREFIX
              Prefix to use for custom property names when missing
              policy is 'use-custom-properties'. The default is
              'elevator'.

--infrastructure
              Infrastructure will be included in the conversion.
              Default for version 2.1 is true.

--incidents
              Incidents will be included in the conversion.
              Default for version 2.1 is true.

--acs
              Process ACS data markings
              Default is false.

--package-created-by-id PACKAGE_CREATED_BY_ID
              Use provided identifier for "created_by_ref"
              properties.

              Example: --package-created-by-id "identity--1234abcd-1a12-42a3-0ab4-1234abcd5678"

--default-timestamp DEFAULT_TIMESTAMP
              Use provided timestamp for properties that require a
              timestamp.

              Example: --default-timestamp "2016-11-15T13:10:35.053000Z"

--validator-args VALIDATOR_ARGS
              Arguments to pass to stix2-validator.
              See https://stix2-validator.readthedocs.io/en/latest/options.html.

              Example: --validator-args="-v --strict-types -d 212"

-e ENABLED, --enable ENABLED
              A comma-separated list of the stix2-elevator messages
              to enable. Not to be used with --disable.

              Example: --enable 250

-d DISABLED, --disable DISABLED
              A comma-separated list of the stix2-elevator messages
              to disable. Not to be used with --enable.

              Example: --disable 212,220

-s, --silent
              If this flag is set, all stix2-elevator messages will
              be disabled.

--message-log-directory MESSAGE_LOG_DIRECTORY
              If this flag is set, all stix2-elevator messages will
              be saved to a file. The name of the file will be the
              input file with extension .log in the specified
              directory.

              Note, make sure the directory already exists.

              Example: --message-log-directory "../logs".

--log-level {DEBUG,INFO,WARN,ERROR,CRITICAL}
              The logging output level.

-m MARKINGS_ALLOWED, --markings-allowed MARKINGS_ALLOWED
              Avoid error exit, if these markings types
              (as specified via their python class names) are in the
              content, but not supported by the elevator. Specify as
              a comma-separated list.

              Example: --markings-allowed "ISAMarkingsAssertion,ISAMarkings"

-p {no_policy,strict_policy},
--error-policy {no_policy,strict_policy},
--policy {no_policy,strict_policy}   #deprecated
             The policy to deal with errors. The default is 'no_policy'.

-v {2.0,2.1}, --version {2.0,2.1}
             The version of stix 2 to be produced. The default is 2.1

-r, --ignore-required-properties
                      Do not provide missing required properties

Refer to elevator_log_messages.rst for all stix2-elevator messages. Use the associated code number to --enable or --disable a message. By default, the stix2-elevator displays all messages.

Note: disabling the message does not disable the functionality.

As A Library

You can also use this library to integrate STIX elevation into your own tools.

# Elevate a STIX 1.x via filename
# Use set_option_value to override default elevator options
# Read the documentation for options
from stix2elevator import elevate
from stix2elevator.options import initialize_options, set_option_value

initialize_options(options={"spec_version": "2.1"})

results = elevate("stix_file.xml")
print(results)

The same method can also accept a string as an argument.

# Elevate a STIX 1.x via string
# Use set_option_value to override default elevator options
# Read the documentation for options
from stix2elevator import elevate
from stix2elevator.options import initialize_options, set_option_value

initialize_options(options={"spec_version": "2.1"})

results = elevate(")
print(results)

To set others options, use set_option_value() found in options.py, or add them as keywords to initialize_options().

Using the stepper

The stix-stepper is a simple script that will convert STIX 2.0 content to STIX 2.1 content.

You can invoke it as follows.

$ stix_stepper <2.0 file>

The 2.1 content is printed to stdout

Governance

This GitHub public repository ( https://github.com/oasis-open/cti-stix-elevator ) was proposed <https://lists.oasis- open.org/archives/cti/201610/msg00106.html>__ and approved <https://lists.oasis- open.org/archives/cti/201610/msg00126.html>__ [bis] by the OASIS Cyber Threat Intelligence (CTI) TC as an OASIS TC Open Repository <https://www.oasis-open.org/resources/open- repositories/>__ to support development of open source resources related to Technical Committee work.

While this TC Open Repository remains associated with the sponsor TC, its development priorities, leadership, intellectual property terms, participation rules, and other matters of governance are separate and distinct <https://github.com/oasis-open/cti-stix- elevator/blob/master/CONTRIBUTING.md#governance-distinct-from-oasis- tc-process>__ from the OASIS TC Process and related policies.

All contributions made to this TC Open Repository are subject to open source license terms expressed in the BSD-3-Clause License <https://www.oasis-open.org/sites/www.oasis- open.org/files/BSD-3-Clause.txt>__. That license was selected as the declared "Applicable License" <https://www.oasis-open.org/resources/open- repositories/licenses>__ when the TC Open Repository was created.

As documented in "Public Participation Invited <https://github.com/oasis-open/cti-stix- elevator/blob/master/CONTRIBUTING.md#public-participation- invited>__", contributions to this OASIS TC Open Repository are invited from all parties, whether affiliated with OASIS or not. Participants must have a GitHub account, but no fees or OASIS membership obligations are required. Participation is expected to be consistent with the OASIS TC Open Repository Guidelines and Procedures <https://www.oasis-open.org/policies-guidelines/open- repositories>__, the open source LICENSE <https://github.com/oasis-open/cti-stix- elevator/blob/master/LICENSE>__ designated for this particular repository, and the requirement for an Individual Contributor License Agreement <https://www.oasis-open.org/resources/open- repositories/cla/individual-cla>__ that governs intellectual property.

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Initially, the associated TC members have designated one or more persons to serve as Maintainer(s); subsequently, participating community members may select additional or substitute Maintainers, per consensus agreements <https://www.oasis-open.org/resources/open- repositories/maintainers-guide#additionalMaintainers>__.

Current Maintainers of this TC Open Repository

• Jason Keirstead; GitHub ID: ; WWW: IBM
• Duncan Sparrell; GitHub ID: ; WWW: sFractal

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